Summary:

The pilot commenced takeoff from the left side of the grass runway in order to avoid wetter ground to the right. There was a crosswind from the right and the aircraft deviated to the left early in the takeoff roll. The pilot abandoned the takeoff and attempted to slow the aircraft, but wheel braking was ineffective on the wet surface. The pilot was unable to prevent the aircraft leaving the runway on the left-hand side, where it encountered a drainage ditch and came to an abrupt stop.